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Re: LOGBUFF size

Posted By: Fernando Nunes
Date: Thursday, 26 May 2016, at 1:27 p.m.

In Response To: LOGBUFF size (FRANK)

A couple of questions:

1- Do you have HDR?
2- What is the logmode of your databases? Buffered, Unbuffered?

The reasons behind the questions are:

- If you hae HDR, when the buffers are flushed in the primary (to disk)
they are also copied to the "HDR buffers". We have 12 of these but
occasionally if the secondary or the network is dragging they may fill up
and cause waits on the primary

- If you have unbuffered logging like most customers do, the size of the
LOGBUFF becomes rather irrelevant because most of the times it will never
get full. Because each time a transaction is closed the buffer is flushed.
And this may cause some extra contention.... And there's little you can
do... the options would be:

a) Change your databases to buffered logging -> BAD IDEA as you may cause
inconsistencies between the database and external systems
b) Change the buffer mode at session level.... sessions that could live
with buffered can be set to it. But the other sessions will continue to
force flushing
c) Put your logs on the fasted disk you have... keepin mind that seek
timemay not be very important and the writes are sequential... the number
of IOPs is crucial

Now... after describing a bad scenario.... what really i your problem? A
few sessions with G flag once in a while? If yes, ignore it... no one will
Keep in mind that the flush occurs many times per second in an heavily used
systems.... When you see a session in "G" chances are it went htough many
other "G" cycles before you process that information...

Now... if you want this solved, please vote on this feature:

It would help.... The basic idea is simple and in some formi already used
in DB2 and Oracle. SQL Server seems to have implemented what we have in one
of the latest releases:

The problem of buffering is that you can tell the application a COMMIT was
ok, when you still can loose it. So why not BUFFER anyway and delay the
answer to the application until you actually flush?
The implementation can't be that simple... the worst case scenario would be
a single application running on a server... the buffer would never fill, so
it would be stuck... some sort of timer must be implemented to force the
flush if meanwhile the buffer hasn't fill up.


On Thu, May 26, 2016 at 5:28 PM, FRANK <> wrote:

> Hi,
> We set ,
> Occasionally, I still see this sometimes,
> 58087a28 Y--P--- 4082303 saapmgr - 551cf760 0
> 1 0 0
> 580882e8 G-BPX-- 3671545 saapmgr - 526d0898 0
> 2 29 48411
> 58088ba8 Y--P--- 2478091 saapmgr - 55a96230 0
> 1 116 14986
> So, a session is waiting for the log buffer .
> The doc ( below) seems not to recommend to set it higher or .... .
> What do you think or comments ?
> Thanks
> Frank
> LOGBUFF configuration parameter
> Use the LOGBUFF configuration parameter to specify the size in kilobytes
> for the three logical-log buffers in shared memory.
> onconfig.std value LOGBUFF 64 units Kilobytes values An integer in the
> range of 32 - (32767 * pagesize / 1024), where pagesize is the default
> system page size. The value must be evenly divisible by the default system
> page size. If the value is not evenly divisible by the page size, the
> database server rounds down the size to the nearest value that is evenly
> divisible by the page size. takes effect After you edit your onconfig file
> and restart the database server.
> Usage
> The three logical log buffers permit user threads to write to the active
> buffer while one of the other buffers is being flushed to disk. If flushing
> is not complete by the time the active buffer fills, the user thread begins
> writing to the third buffer.
> If the RTO_SERVER_RESTART configuration parameter is enabled, set the value
> of the LOGBUFF configuration parameter to 256 kilobytes. If the value of
> the LOGBUFF configuration parameter is less than 256 kilobytes, a warning
> message displays when you restart the server.
> Otherwise, set the value of the LOGBUFF configuration parameter to 32
> kilobytes for standard workloads or 64 kilobytes for heavy workloads. The
> database server uses the LOGBUFF parameter to set the size of internal
> buffers that are used during recovery. If you set LOGBUFF too high, the
> database server can run out of memory and shut down during recovery.
> If you log user data in smart large objects, increase the size of the log
> buffer to make the system more efficient. The database server logs only the
> portion of a smart-large-object page that changed.
> You can view information about the logical log buffers by running the
> onstat
> -l command.
> *Parent topic:* Database configuration parameters
> <
> >
> *Related reference*:
> onstat -l command: Print physical and logical log information
> <
> >
> --001a11c1728c309b400533c148a4
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.

Fernando Nunes
My email works... but I don't check it frequently...


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